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Related Experiment Videos

Palatal shelf elevation in the Wistar rat fetus.

M W Ferguson

    Journal of Anatomy
    |March 1, 1978
    PubMed
    Summary

    Palatal shelf elevation in Wistar rat fetuses occurs rapidly around day 16.4, driven by turgor pressure from mucopolysaccharide accumulation. This rapid elevation is crucial for forming the common nasal passage.

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    Area of Science:

    • Developmental biology
    • Embryology
    • Oral and maxillofacial surgery

    Background:

    • Palatogenesis, the process of palate formation, is a complex developmental event crucial for separating the oral and nasal cavities.
    • Understanding the precise mechanisms and timing of palatal shelf elevation is essential for identifying causes of cleft palate.

    Purpose of the Study:

    • To investigate the macroscopic, microscopic, ultrastructural, and experimental aspects of palatogenesis in Wistar rat fetuses between days 13 and 19.
    • To elucidate the driving forces and developmental timing of palatal shelf elevation and fusion.

    Main Methods:

    • Detailed developmental staging of Wistar rat fetuses using crown-rump lengths.
    • Macroscopic, microscopic, and ultrastructural examination of palatogenesis.
    • Experimental induction of palatal shelf elevation in freshly delivered fetuses.

    Main Results:

    • Palatal shelf elevation occurs rapidly around day 16.4 +/- 0.1.
    • Increasing mucopolysaccharide accumulation and edema in the mesenchymal matrix precede and facilitate shelf elevation.
    • Shelf elevation and fusion initiate anteriorly and proceed posteriorly, with rapid osteogenic invasion post-elevation.
    • Tongue repositioning and flattening are critical for creating space for the common nasal passage formation.

    Conclusions:

    • Palatal shelf elevation is a rapid event at a precise developmental stage, primarily driven by turgor pressure resulting from water binding to mucopolysaccharides.
    • Existing theories of shelf elevation are inconsistent with the observed rapid, turgor-driven mechanism.
    • The findings provide critical insights into normal palatogenesis and potential mechanisms underlying cleft palate development.

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